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Tim a,b thuộc N sao . Biết a+b=40 và BCNN(a,b) = 7.UCLN(a,b)
a, ab = 360 va BCNN[ a;b] = 60
b, UCLN[a:;b] =12 va BCNN[a;b] = 72
c, UCLN[a;b] = 15 va BCNN[a;b]=2100.UCLN[a;b]
Biet rang : BCNN(a,b).UCLN(a,b)
a, BCNN cua hai so la 600, UCLN cua chung nho hon 10 lan BCNN. So thu 1 la 120, tim so thu 2.
b, UCLN cua hai so la 12, BCNN cua chung lon gap 6 lan UCLN . So t 1 la 24, tim so t 2
c, Tong cua hai so bang 60, tong giua UCLN va BCNN cua chung la 84. Tim hai so do.
tim a,b thuoc N biet BCNN(a,b)+UCLN(a,b)=14
tim a,b thuoc N biet BCNN(a,b)+UCLN(a,b)=14
BCNN(a,b) + UCLN(a,b) =19 tim ab
cho a = 45 ; b = 204 ; c = 126
a)tim UCLN (a,b.c)
b)tim BCNN (a,b)
cho a = 35 , b = 40 , c = 210
a ) tim UCLN ( a,b,c )
b ) tim BCNN ( a,b,c )
Tim 2 so a va b biet UCLN(a,b)=12;BCNN(a,b)=72